Characteristic dysfunction of stunned myocardium induced by 2,3-butanedione monoxime without ischaemia

X. Wang, X. M. Guan, G. P. Li, Y. Ren, Gary Drzewiecki, John Li, J. Kedem

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

1. In the present study, we tested the hypothesis that, even in the absence of prior ischaemia, 2,3-butanedione monoxime (BDM), an inhibitor of contraction at the actin-myosin level, could produce the postischaemic dysfunction characteristic of stunned myocardium. 2,3-Butanedione monoxime was injected directly into the left anterior descending coronary artery (LAD) before and again after myocardial stunning produced by 15 min occlusion of the LAD followed by 30 min reperfusion. 2. Regional myocardial force, segment shortening and regional work were measured in both the LAD-perfused area and the area perfused by the circumflex coronary artery, which served as a control area. Regional dysfunction produced by BDM injection or ischaemia-reperfusion was assessed quantitatively by five parameters: end-diastolic length (EDL), shortening onset delay (delay), systolic bulge (bulge), end-shortening time delay (EST) and tail work ratio (TWR). 3. It was found that injection of BDM into the LAD caused dyskinesis similar to that caused by occlusion-reperfusion. Both displayed elevated EDL and marked increases in delay, bulge, EST and TWR; these parameters were significantly higher in the dyskinesis caused by BDM injection. Despite dysfunctional fibre shortening, intracoronary BDM injection did not reduce regional force. 4. Thus, BDM can elicit changes similar to those characteristic of postischaemic dysfunction. Because contractility was not impaired, dysfunction was apparently caused by disrupting the association between contractile force and muscle motion.

Original languageEnglish (US)
Pages (from-to)968-974
Number of pages7
JournalClinical and Experimental Pharmacology and Physiology
Volume32
Issue number11
DOIs
StatePublished - Nov 1 2005

All Science Journal Classification (ASJC) codes

  • Physiology (medical)
  • Physiology
  • Pharmacology

Keywords

  • 2,3-butanedione monoxime
  • Contractility
  • Myocardial stunning
  • Postischaemic dysfunction

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